a {
  text-decoration: none;
}
html {
  font-size: 50px;
}
body {
  font-size: 24px;
}
@media screen and (min-width: 320px) {
  html {
    font-size: 21.33333333px;
  }
  body {
    font-size: 12px;
  }
}
@media screen and (min-width: 360px) {
  html {
    font-size: 24px;
  }
  body {
    font-size: 12px;
  }
}
@media screen and (min-width: 375px) {
  html {
    font-size: 25px;
  }
  body {
    font-size: 12px;
  }
}
@media screen and (min-width: 384px) {
  html {
    font-size: 25.6px;
  }
  body {
    font-size: 14px;
  }
}
@media screen and (min-width: 400px) {
  html {
    font-size: 26.66666667px;
  }
  body {
    font-size: 14px;
  }
}
@media screen and (min-width: 414px) {
  html {
    font-size: 27.6px;
  }
  body {
    font-size: 14px;
  }
}
@media screen and (min-width: 424px) {
  html {
    font-size: 28.26666667px;
  }
  body {
    font-size: 14px;
  }
}
@media screen and (min-width: 480px) {
  html {
    font-size: 32px;
  }
  body {
    font-size: 15.36px;
  }
}
@media screen and (min-width: 540px) {
  html {
    font-size: 36px;
  }
  body {
    font-size: 17.28px;
  }
}
@media screen and (min-width: 720px) {
  html {
    font-size: 48px;
  }
  body {
    font-size: 23.04px;
  }
}
@media screen and (min-width: 750px) {
  html {
    font-size: 50px;
  }
  body {
    font-size: 24px;
  }
}
body {
  width: 15rem;
  min-width: 320px;
  margin: 0 auto;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
  background-color: #f2f2f2;
}
.header-bar {
  display: flex;
  height: 1.76rem;
  background-color: #ffc001;
  position: fixed;
  width: 15rem;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
}
.header-bar > .categories {
  width: 0.88rem;
  height: 1.4rem;
  margin: 0.22rem 0.5rem 0.14rem 0.48rem;
  background: url("../images/classify.png") no-repeat;
  background-position: center center;
  background-size: 0.88rem 1.4rem;
}
.header-bar > .search-box {
  flex: 1;
}
.header-bar > .search-box input {
  box-sizing: border-box;
  outline: none;
  border: 0;
  width: 100%;
  height: 1.32rem;
  margin-top: 0.24rem;
  border-radius: 0.66rem;
  padding-left: 0.9rem;
  font-size: 0.5rem;
  color: #757575;
}
.header-bar > .login-btn {
  width: 1.5rem;
  height: 1.4rem;
  margin: 0.2rem;
  line-height: 1.4rem;
  text-align: center;
  color: #fff;
}
